JP3079847U - Corrugated cardboard case for storage capacity - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even when odd numbers of articles less than a predetermined number are stored in a corrugated cardboard case, the movement of the articles is suppressed without using accessories and the bottoming out is prevented. Provided is a cardboard case of a storage number corresponding type that can stably store articles. SOLUTION: The cardboard case has a bottom surface, a side surface, and a lid surface, and can store a predetermined number of articles, and has an inner flap from an upper edge of the side surface and an outer flap 2 constituting the lid surface. Are extended, and as the inner flap, the fold lines L1, L2 are folded at predetermined positions so that at least the number of articles stored in the case is less than the predetermined number and the articles can be folded and pressed down. The buffer flaps 3 and 5 provided with L3 and the insole flap 4 provided with a fold line L4 and having a tip 4a bent along the fold line laid on the bottom surface of the case. 1. A cardboard case 1 corresponding to the number of storages, comprising:

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cardboard case, and more specifically, to a cardboard case capable of coping with differences in the number and quantity of articles to be stored and stably storing the articles.

[0002]

[Prior art]

 Conventionally, when carrying or storing flat products, for example, a cardboard case has been used. By storing a predetermined number of these products in a corrugated cardboard case and storing them, it becomes easier to manage the products and to transport a large amount of products. Other cases for storing products include plastic and metal cases, but cardboard cases are inexpensive to manufacture and lightweight, and can be incinerated or recycled after use. It is also excellent in that it can be recycled relatively easily.

When storing a product (article) in a corrugated cardboard case, if a predetermined number of articles that fill the case are accommodated, the movement of the article in the case is suppressed, so there is no problem. If it is necessary to store an odd number of items, accessories such as styrofoam and cardboard pieces must be packed in the space created in the case. By doing so, the product can be prevented from moving inside the case, and at the same time, can function as a cushioning material to reduce external impact.

For example, when three products are put in a corrugated cardboard case that can store five flat products in a horizontally stacked state, a space is created above the three stacked products inside the case. If the lid is closed and stored as it is, the product will move in the case during transportation, which may cause damage to the product. In order to prevent such damage and the like, it is necessary to suppress the movement of the product by packing and storing the cushioning accessories as described above in the space in the case.

[0005]

[Problems to be solved by the invention]

 As described above, when accessories such as cardboard pieces and styrofoam are packed and stored together with the product, not only the production costs of these accessories are extra, but also the accessories themselves are bulky, so management is difficult. There is a problem. In addition, when styrofoam is used, it is difficult to recycle after use, and there is a problem that it is difficult to dispose because it is handled as incombustible waste.

On the other hand, when a cardboard piece is used as an accessory, it can be disposed of together with the cardboard case after use. However, if the odd number of products less than the number of cases stored in the case is stored in the case, It is necessary to always prepare a large number of corrugated ball pieces to fill the space in the case, which is uneconomical. Also, if a case with a different size is to be made separately for an odd number, a variety of cases must be made, which is costly and difficult to manage. In addition, in the case of a cardboard case, the bottom is configured by combining the flaps on the bottom and fixing it with adhesive tape or staples as necessary.However, if the storage is heavy, the bottom of the case may come off. is there.

[0007] In view of the above problems, the present invention suppresses the movement of an article without using accessories even when an odd number of articles less than a predetermined storage quantity are stored in a cardboard case. In addition, an object of the present invention is to provide a corrugated cardboard case that can accommodate the number of items that can be stably stored by preventing bottoming out.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, there is provided a corrugated cardboard case having a bottom surface, side surfaces, and a lid surface and capable of storing a predetermined number of articles, wherein an inner flap and an inner flap are provided from an upper edge of the side surface. The outer flap constituting the lid surface extends so that the inner flap can be folded and held down when at least the number of articles stored in the case is less than the predetermined number. A buffer flap having a fold line at a predetermined position, and an insole flap having a fold line and a portion bent along the fold line being laid on the bottom surface of the case. The present invention provides a corrugated cardboard case capable of accommodating the number of storages, comprising:

The inner flap having the fold line provided at a predetermined position functions as a buffer flap that holds down an article and exhibits a cushioning effect by being bent in accordance with the number of articles stored in the case. I do. If such a cardboard case is used, it is possible to store other cardboard pieces and styrofoam and other accessories in accordance with the number of articles without packing them together. In addition, the cardboard case according to the present invention also has an insole flap in which the folded part as the inner flap is laid on the bottom of the case, so that the bottom of the case is flat without using other cardboard pieces. Shape. The insole flap has a cushioning effect and also has an effect of preventing the bottom of the case from coming off even when a heavy item is stored, so that the item can be stored more stably.

[0010] It is preferable that a plurality of fold lines are provided on the buffer flap of the cardboard case. The buffer flap provided with a plurality of fold lines in this manner can accommodate various storage numbers.

[0011] As a specific cardboard case according to the present invention, the cardboard case can store up to five flat items in an overlapping manner, and the case contains one or three of the items. Or two or four fold lines are provided so that the buffer flap bent at a right angle along the fold line of the buffer flap can hold down an article when two or four are stored. Can be.

When the case can accommodate up to five pieces, all the fractions may be accommodated. However, as described above, a fold line may be provided so as to accommodate the two types of fractions. If this is the case, the strength of the buffer flap can be sufficiently maintained and a high buffer effect can be exhibited.

[0013] In this case, a notch may be provided at a side edge of the buffer flap to distinguish a fold line to be folded in accordance with the number of pieces stored. By providing notches for distinguishing the fold lines in this manner, even if the buffer flap has a large number of fold lines, it is possible to easily determine how to fold according to the number of storages.

It is preferable that the fold line provided on the buffer flap and / or the insole flap is a perforated line. If the fold lines of the buffer flap and the insole flap are perforated lines as described above, it is easy to fold at a desired position, and it is easy to keep the shape once folded.

It is preferable that a locking means is provided on the outer flap and the side surface of the case. After storing the items in the case and folding the shock-absorbing flap, the outer flap serving as the lid is closed, but if the above-mentioned locking means is provided, the lid can be securely closed even during transportation etc. It is possible to prevent the product from jumping out and keep the bent shape of the buffer flap so as to always hold the product.

Regarding the shape and the like of the case, the corrugated cardboard case has a rectangular shape, and two opposing inner flaps form a buffer flap, and an inner flap facing the outer flap forms an insole flap. Is preferred. By making each flap a rectangular corrugated cardboard case arranged as described above, even if a fractional number of items are stored, the two cushioning flaps and one insole flap exhibit more effective cushioning. And it is possible to reliably prevent the bottoming out. In addition, such a rectangular case is easy to manufacture, and can accommodate various shapes such as a disk-shaped product as well as a square product.

It is preferable that four bottom flaps extending from the lower edge of the side surface of the rectangular corrugated cardboard case and forming the bottom surface of the case are joined by two adjacent pieces. . When a rectangular corrugated cardboard case in which the bottom flaps are joined by two adjacent pieces in this manner, folding and assembly become very easy. Therefore, before use, the storage space can be reduced by bundling and bundling, and it is easy to carry. Also, when storing items, the case can be opened with a single touch, making packing easier.

It is preferable that the corrugated cardboard case according to the present invention is assembled from a piece of corrugated cardboard punched out in a developed shape of the case. By punching one piece of corrugated cardboard into a desired developed shape and assembling the case in this way, the case can be easily manufactured and the manufacturing cost can be reduced.

In this case, the unfolded shape is such that the height of the insole flap is the same as the height of the outer flap, and each of the flaps is continuous from the tip of each flap across the side surface of the case. It is preferable that the width up to the tip of the bottom flap is the same. In this way, by aligning the height of the insole flap to the height of the outer flap, aligning the height of the corresponding bottom flap and punching the same width, the mechanical flow from punching to assembly can be completed. As a result, cases can be mass-produced efficiently.

[0020]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto. FIG. 1 shows an example of a cardboard case according to the present invention, and FIGS. 2 and 3 show how the cushioning flap of the cardboard case is bent and the developed shape of the cardboard case, respectively.

The cardboard case according to the present invention is a cardboard case having a bottom surface, a side surface, and a lid surface, and capable of storing a predetermined number of articles, wherein an inner flap and the lid surface extend from an upper edge of the side surface. The outer flap constituting the inner flap is extended, and the inner flap is bent at least when the number of articles stored in the case is less than the predetermined number, so that the inner flap can be held down by a predetermined amount. A shock-absorbing flap provided with a fold line at a position, and an insole flap provided with a fold line and a portion bent along the fold line being laid on the bottom surface of the case. It is characterized by

In FIGS. 1 and 3, four flaps 2, 3, 4, and 5 extend from the upper edge of the side surface of the rectangular case 1, and one of the flaps 2 forms an outer flap 2 to form a lid surface. are doing. Two opposing inner flaps 3 and 5 extend from the upper edges of the side surfaces on both sides of the case 1. These opposing inner flaps 3 and 5 constitute buffer flaps provided with fold lines L1, L2 and L3 at predetermined positions, respectively. The cushioning flaps 3, 5 can be bent along the fold line in accordance with the number of articles stored in the case 1 to hold down the articles and exhibit a cushioning property.

Further, apart from the outer flap 2 and the buffer flaps 3 and 5, a fold line L4 is provided as the inner flap 4 facing the outer flap 2 and a tip bent along the fold line L4 is provided. An insole flap 4 is provided in which the portion 4a is laid on the bottom surface of the case 1.

The fold line L4 of the insole flap 4 is provided at a position away from the base of the flap 4 by the height of the side surface 14 of the case 1, and the insole flap 4 is separated from the base by the case. 1 and valley folds at a substantially right angle along the fold line L4, so that the bent end portion 4a of the insole flap 4 is laid on the bottom surface of the case 1.

The fold lines L 1, L 2, L 3, L 4 of the buffer flaps 3, 5 and the insole flap 4 are similar to the folds at the base of each flap and the corner folds of the side portions 13, 14, 15. In the corrugated cardboard case shown in FIG. 1, the fold line is formed by a perforated sewing line at a predetermined interval. If the fold line is a perforated line in this way, it becomes easy to bend and it is easy to maintain the once bent shape, so that the buffer effect can be maintained.

The illustrated corrugated cardboard case 1 can specifically store up to five flat items in an overlapping manner, and stores one or three items in the case 1 in an overlapping manner. Sometimes, the shock absorbing flaps 3 and 5 bent at right angles along the fold lines of the buffer flaps 3 and 5 partially fill the space opened in the case and hold down the articles so that the articles can be pressed down. Sewing lines L1, L2, L3 are provided. In addition, since the insole flap needs to be bent at about 180 degrees at the root thereof, a perforated line L6 is also provided between the side portion and the insole flap.

FIG. 2 is a diagram illustrating how the buffer flaps 3 and 5 are bent when the case 1 is viewed from the front. When five flat articles, which are the maximum storage number (predetermined storage number) of the case 1, are stacked and stored, the inside of the case 1 is filled with the articles 20 as shown in FIG. Therefore, there is no need to bend the buffer flaps 3 and 5, and only the bases of the buffer flaps 3 and 5 need to be bent and overlapped on the article 20.

On the other hand, when three articles 20 are stored and stacked, the bases of the buffer flaps 3 and 5 are bent inward as shown in FIG. A mountain fold is made at right angles along the closest perforation line L3, and a valley fold is made at right angles along the next perforation line L2. In the corrugated cardboard case 1 shown in FIG. 1, triangular and semicircular cuts 6 and 7 are provided on the side edges of the buffer flaps 3 and 5, respectively, so that the sewing lines to be folded can be distinguished according to the number of storage. I have. That is, when three pieces are stored, they may be bent along the perforation lines L2 and L3 each having a triangular cut 6 at one end. By providing notches for distinguishing the fold lines in the buffer flap in this way, even if a large number of fold lines are provided so as to correspond to a plurality of fractions, it is easy to fold according to the number of storages. Judgment can be made, and the storing operation becomes very easy, and mistakes can be prevented.

In the buffer flap 5 bent as described above, the height of the portion 5c between the sewing lines L2 and L3 is substantially equal to the thickness of two articles, and the portion of 5c is the article. And the portions 5a and 5b ahead of the sewing line L2 overlap the article 20. By bending the other opposing buffer flap 3 in the same manner, the article can be held down by the two opposing buffer flaps 3 and 5. Note that the order of bending is not limited to the above procedure as long as the opposing buffer flaps 3 and 5 can eventually bend as shown in FIG.

FIG. 2C shows how the buffer flaps 3 and 5 are folded when one article 20 is stored in the case 1. The width of the portion 5b between the sewing lines L2 and L1 corresponds to the thickness of four articles. Accordingly, the bases of the buffer flaps 3 and 5 are bent inward, and the respective buffer flaps 3 and 5 are mountain-folded and valley-folded at right angles along the perforated lines L2 and L1 provided with the semicircular cuts 7, respectively. The portions 3a and 5a of the flaps 3 and 5 ahead of the perforation line L1 can be overlapped with the article 20 and held down.

After the buffer flaps 3 and 5 are bent according to the number of articles stored as described above, the outer flap (lid) 2 is closed. In the corrugated cardboard case 1 shown in FIG. 1, an insertion flap 17 is formed at the tip of the lid 2 through a fold so that the tip of the outer flap 2 is inserted into the side portion 14 of the case 1. Further, a locking hole 18 is provided at the center of the fold of the insertion flap 17.

On the other hand, a locking piece 19 to be inserted into a locking hole 18 is provided at the center of the upper edge of the side surface portion 14 into which the insertion flap 17 is inserted. In this manner, the locking means 18 and 19 provided on the outer flap (lid) 2 and the side surface of the case 1 lock the lid 2 when the lid 2 is closed. Can be prevented from opening, and the shape of the folded buffer flap can be maintained so that the article can be reliably pressed down, thereby exhibiting a buffer effect.

The buffer flaps 3 and 5 bent so as to hold an odd number of articles function as a cushioning material, and an accessory (a cushioning material) such as styrene foam, which is conventionally required, is separately prepared. Becomes unnecessary. In addition, there is no need to separately manufacture a corrugated ball case with different sizes for fractions.

For example, even if one disc-shaped wound chip tape (about 20 cm in diameter and about 1 cm in height) is stored in the corrugated cardboard case shown in FIG. 1, as shown in FIG. Since the tape is held down by bending 3,5, the tape does not move violently in the case during transportation, so that the quality does not deteriorate or breakage occurs. In addition, the entire case is made of cardboard, and it is not necessary to use styrene foam, which is difficult to recycle, so that it can be easily recycled after use.

As described above, the corrugated cardboard case 1 of FIG. 1 can accommodate not only a case where five items which are the maximum number of items to be stored but also a case where one or three items are stacked and stored. Crease lines (sewing lines) are provided on the buffer flaps so that the number and positions of the fold lines are not limited thereto. For example, by giving a fold line so that the height of 5c and 5b is equivalent to one product and three products, respectively, the corrugated cardboard case can be used when two or four products are stacked and stored. Can be done. Dividing into several types of crease lines according to the fractional numbers in this way makes it very easy to store them.

In addition, a fold line can be provided so as to be able to deal with one to all five. However, if the number of fold lines is too large, there is an advantage that various fractions can be handled.However, the buffer flap may be easily broken and the buffer effect may be reduced. It is preferable to provide as many fold lines as possible. If the number of fold lines applied to the buffer flap is appropriately suppressed in this way, the strength of the buffer flap can be sufficiently maintained, and an excellent buffer effect can be exhibited.

The method of manufacturing the corrugated cardboard case according to the present invention is not particularly limited, but by assembling one piece of corrugated cardboard into a developed shape of the case, the manufacture is easy and the strength of the case is improved. It can be sufficiently high. FIG. 3 shows a developed shape 11 of the cardboard case 1 of FIG. Side portions 12, 13, 14, 15 of uniform height constituting the side surface of the case are arranged via a crease 21, and from the upper edge thereof, an outer flap 2, a buffer flap 3, an insole flap 4, a buffer flap. 5 respectively extend. Also, four pieces of bottom flaps 22, 23, 24 and 25 constituting the bottom of the case extend from the lower edge.

In the developed shape 11, the height of the insole flap 4 and the height of the outer flap 2 are the same, and the end portions of the flaps 2, 4 sandwich the side portions 12, 14 of the case. The width of each of the bottom flaps 22 and 24 connected to each other is the same. By punching the cardboard base paper into such a developed shape 11, the subsequent assembling work becomes easy.

That is, in the case where a case is manufactured by a flow operation by machining, a corrugated cardboard punched into a desired developed shape is then sent to an assembling process, but only the outer flap is high (long) and the inner flap is low ( If it is punched out (short), for example, it may be obliquely displaced while flowing along a conveyor path such as a belt conveyor in the longitudinal direction of the developed shape, and a series of machining operations may be delayed. On the other hand, as shown in FIG. 3, the height of the insole flap 4 is made equal to the height of the outer flap 2, and the heights of the corresponding bottom flaps 22 and 24 are made equal to each other, so that the unfolded shape has the same width. If it is punched in the same direction, it will be positioned at two locations with the same width, so it will not be inclined when it is flowing in the transport path, etc., and the mechanical flow work from the punching process to the assembly process will be smooth. And productivity can be improved.

For the punching process, a conventional method can be applied. For example, a cardboard base paper can be punched out once by a press using a mold provided with a punching blade. Also, a fold line, a sewing line, or the like can be formed at a predetermined position at the same time as punching.

To assemble the case 1 of FIG. 1 from the corrugated cardboard punched into the developed shape 11 of FIG. 3, the side portions 12, 13, 14, and 15 are bent at right angles along each fold 21 and four pieces are formed. The bottoms of the bottom flaps 22, 23, 24, 25 are bent inward of the case (the direction in which each flap is raised from the plane of FIG. 3), and the tips of the bottom flaps 22, 23, 24, 25 are adjacent to the bottom. Combine it so that it is located on the top of the flap to form the bottom of the case. Further, the case 1 in FIG. 1 is assembled by applying an adhesive, a double-sided tape, or the like to the side surface bonding portion 16 and bonding the side portions 12, 15 at both ends. Note that a gum tape, a staple, or the like may be used as the bonding means.

The four bottom flaps 22, 23, 24, and 25 extending from the lower edge of the side surface of the cardboard case and constituting the bottom surface of the case are joined by two adjacent pieces. Is preferred. In the unfolded shape 11 of FIG. 3, the outer flap 2 and the insole flap 4 have bonding portions 22a and 24a respectively provided on two bottom flaps 22 and 24 extending across the side portions 12 and 14, respectively. . An adhesive or the like is applied to these bonding portions 22a, 24a, and can be bonded to the lower surfaces of the adjacent bottom flaps 23, 25, respectively.

Since the fold lines (sewing lines) L5 are provided at the boundaries between the bonding portions 22a and 24a of the bottom flaps 22 and 24, the bottom flaps are joined as described above during assembly. Then, after joining, the side can be opened and the case can be completed easily with one touch.

FIG. 4 is a bottom view of the bottom of the corrugated cardboard case 1 of FIG. 1 assembled as described above. The bottom flaps 22 and 23 are joined at the bonding portion 22a, and the bottom flaps 24 and 25 are joined together. Are joined at the bonding portion 24a. By joining the bottom flaps in this way, the strength of the bottom surface of the case can be increased, so that even if the articles to be stored are heavy, they can withstand sufficiently.

The assembled case 1 can be easily folded with one touch by bending the case 1 inward along the fold line L5 on the bottom surface. Therefore, if the assembled cardboard case 1 is folded and bound, the storage space can be saved. On the other hand, when storing items in the case 1, the case 1 is placed so that the bottom surface is horizontal. Can be easily opened for storage.

The present invention is not limited to the above embodiment. The above embodiment is merely an example, and any one having substantially the same configuration as that of the technical idea described in the claims of the present invention and having the same function and effect will be described. However, it is included in the technical scope of the present invention.

For example, the shape of the case is not limited to a rectangular shape, and may be a rectangular shape, another polygonal shape, or a cylindrical shape. The number of articles stored in the case is not particularly limited. Further, the position and number of the fold lines of the buffer flap and the method of folding the fold lines are not limited to those described in the embodiment, and the angle at which the fold line is bent along the fold line is not necessarily a right angle.

Further, the arrangement of the buffer flap, the outer flap, the insole flap and the like are not limited to those of the embodiment, and the corrugated ball case is constructed without providing a locking means between the outer flap and the side portion. Is also good. In addition, the cardboard case according to the present invention can be applied not only to the number of articles, but also to a case where articles are stored in correspondence with a difference in the storage amount of articles and articles of different sizes.

[0049]

[Effect of the invention]

 The cardboard case according to the present invention is a cushioning flap having a fold line at a predetermined position so that the cardboard case is bent and held down when the number of articles stored in the case is less than a predetermined number. Is provided. Therefore, even when a fractional number of articles are stored, the articles can be held down by the buffer flaps that are bent along the fold lines according to the number of articles. Further, the products stored with the lid closed can be prevented from moving in the case by the buffering function of the buffer flap, and can protect the items in the case even if they are impacted during transportation.

The use of the cardboard case according to the present invention eliminates the need for accessories (buffers) such as polystyrene foam, which were conventionally required when storing a fractional number of articles. Therefore, cost reduction can be achieved, and since the case is composed of only cardboard, it is easy to recycle. In addition, the cardboard case according to the present invention also has an insole flap in which the folded part as the inner flap is laid on the bottom of the case, so that the bottom of the case is flat without using other cardboard pieces. Shape. With this insole flap, even when a relatively heavy item is stored in the case, the bottom can be prevented from coming off, and the item can be stored more stably.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a cardboard case of the present invention.

FIG. 2 is a view for explaining how to fold a buffer flap according to the number of stored cardboard cases shown in FIG. 1;
This is the case where one item is put, (B) three items are put, and (C) one item is put.

FIG. 3 is a view showing a developed shape of the cardboard case shown in FIG. 1 before assembly.

FIG. 4 is a view of the bottom surface of the cardboard case shown in FIG. 1 as viewed from below.

[Explanation of symbols]

1: Corrugated cardboard case, 2: Outer flap (lid), 3,
3a, 3b, 3c, 3d: buffer flap, 4, 4a,
4b ... insole flap, 5, 5a, 5b, 5c, 5d ...
Buffer flap, 6: Triangular cut, 7: Semicircular cut, 11: Expanded shape, 12, 13, 14, 15
... side surface part, 16 ... side surface bonding part, 17 ... insertion flap, 18 ... locking hole, 19 ... locking piece, 20 ... article, 21 ... fold, 22,23,24,25 ... bottom flap, 22a, 24a ... Bottom adhesive, L1, L
2, L3, L4, L5, L6 ... crease line (sewing line).

Claims (10)

[Utility model registration claims] 1. A corrugated cardboard case having a bottom surface, a side surface, and a lid surface, and capable of storing a predetermined number of articles, wherein an inner flap is formed from an upper edge of the side surface and an outer flap constituting the lid surface. Is extended, and as the inner flap, a fold line is provided at a predetermined position so that at least the number of items stored in the case is less than the predetermined number and the item can be bent and pressed. A storage flap provided with a buffer flap and a crease line, and an insole flap provided with a fold line along the fold line and a portion bent along the fold line on the bottom surface of the case. Cardboard case. 2. The cardboard case according to claim 1, wherein a plurality of fold lines are provided on the buffer flap. 3. The corrugated cardboard case has a flat shape.
When one or three, or two or four of the articles are stacked and stored in the case, a right angle is formed along the fold line of the buffer flap. The corrugated cardboard case according to claim 2, wherein a crease line is provided so that the folded buffer flap can hold down an article. 4. A notch for distinguishing a fold line to be folded according to the number of storages, the cut edge being provided at a side edge of the buffer flap.
The cardboard case according to any one of the above. 5. The cardboard case according to claim 1, wherein the fold line provided on the buffer flap and / or the insole flap is a perforated line. 6. The cardboard case according to claim 1, wherein locking means is provided on the outer flap and a side portion of the case. 7. The cardboard case having a rectangular shape, wherein two opposing inner flaps constitute a buffer flap and an inner flap opposed to the outer flap constitutes an insole flap. The cardboard case according to any one of claims 1 to 6. 8. A rectangular cardboard case which extends from a lower edge of a side surface of the cardboard case to form a bottom surface of the case.
The cardboard case according to claim 7, wherein the bottom flaps of the pieces are joined by two adjacent pieces. 9. The corrugated cardboard case is assembled from a piece of corrugated cardboard punched out in a developed shape of the case.
The cardboard case according to any one of the above. 10. The bottom flaps in which the unfolded shape is such that the height of the insole flap is equal to the height of the outer flap, and each of the bottom flaps is continuous from the tip of each of the flaps across the side portion of the case. 10. The corrugated cardboard case according to claim 9, wherein the widths up to the front end of the corrugated cardboard are the same.